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1980. This polygon shapefile contains ice observations in the Arctic region for August 25, 1980. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
1977. This polygon shapefile contains ice observations in the Arctic region for August 30, 1977. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
1987. This polygon shapefile contains ice observations in the Arctic region for August 31, 1987. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
1980. This polygon shapefile contains ice observations in the Arctic region for September 25, 1980. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1980. This polygon shapefile contains ice observations in the Arctic region for September 22, 1980. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1974. This polygon shapefile contains ice observations in the Arctic region for September 23, 1974. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1842, 1843, and 1844. Rumsey, David, 1944- and Southern Pacific Company. The large map of the west is one of the most interesting and beautiful government maps of the 1840's. It filled in many of the gaps in cartographic... Cartography Associates.
1994. This polygon shapefile contains ice observations in the Arctic region for September 5, 1994. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1968. This polygon shapefile contains ice observations in the Arctic region for September 9, 1968. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1978. This polygon shapefile contains ice observations in the Arctic region for October 4, 1978. This polygon shapefile contains ice observations in the ... Arctic Climate System (ACSYS).